The correspondence between convergence peaks from weak lensing and massive dark matter haloes
The correspondence between convergence peaks from weak lensing and massive dark matter haloes
复制标题
弱透镜效应的会聚峰与大量暗物质晕之间的对应关系
DOI：
10.1093/mnras/sty1268
复制
发表时间：
2018-05
影响因子：
4.8
通讯作者：
Pan Chuzhong
中科院分区：
文献类型：
--
作者：
Wei Chengliang;Li Guoliang;Kang Xi;Liu Xiangkun;Fan Zuhui;Yuan Shuo;Pan Chuzhong
The convergence peaks, constructed from galaxy shape measurement in weak lensing, is a powerful probe of cosmology as the peaks can be connected with the underlined dark matter haloes. However the capability of convergence peak statistic is affected by the noise in galaxy shape measurement, signal to noise ratio as well as the contribution from the projected mass distribution from the large-scale structures along the line of sight (LOS). In this paper we use the ray-tracing simulation on a curved sky to investigate the correspondence between the convergence peak and the dark matter haloes at the LOS. We find that, in case of no noise and for source galaxies at $z_{\rm s}=1$, more than $65\%$ peaks with $\text{SNR} \geq 3$ (signal to noise ratio) are related to more than one massive haloes with mass larger than $10^{13} {\rm M}_{\odot}$. Those massive haloes contribute $87.2\%$ to high peaks ($\text{SNR} \geq 5$) with the remaining contributions are from the large-scale structures. On the other hand, the peaks distribution is skewed by the noise in galaxy shape measurement, especially for lower SNR peaks. In the noisy field where the shape noise is modelled as a Gaussian distribution, about $60\%$ high peaks ($\text{SNR} \geq 5$) are true peaks and the fraction decreases to $20\%$ for lower peaks ($ 3 \leq \text{SNR} < 5$). Furthermore, we find that high peaks ($\text{SNR} \geq 5$) are dominated by very massive haloes larger than $10^{14} {\rm M}_{\odot}$.
The convergence peaks, constructed from galaxy shape measurement in weak lensing, is a powerful probe of cosmology as the peaks can be connected with the underlined dark matter haloes. However the capability of convergence peak statistic is affected by the noise in galaxy shape measurement, signal to noise ratio as well as the contribution from the projected mass distribution from the large-scale structures along the line of sight (LOS). In this paper we use the ray-tracing simulation on a curved sky to investigate the correspondence between the convergence peak and the dark matter haloes at the LOS. We find that, in case of no noise and for source galaxies at $z_{\rm s}=1$, more than $65\%$ peaks with $\text{SNR} \geq 3$ (signal to noise ratio) are related to more than one massive haloes with mass larger than $10^{13} {\rm M}_{\odot}$. Those massive haloes contribute $87.2\%$ to high peaks ($\text{SNR} \geq 5$) with the remaining contributions are from the large-scale structures. On the other hand, the peaks distribution is skewed by the noise in galaxy shape measurement, especially for lower SNR peaks. In the noisy field where the shape noise is modelled as a Gaussian distribution, about $60\%$ high peaks ($\text{SNR} \geq 5$) are true peaks and the fraction decreases to $20\%$ for lower peaks ($ 3 \leq \text{SNR} < 5$). Furthermore, we find that high peaks ($\text{SNR} \geq 5$) are dominated by very massive haloes larger than $10^{14} {\rm M}_{\odot}$.
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影响因子：
4.8
作者：
M. Shirasaki;T. Hamana;N. Yoshida
通讯作者：
M. Shirasaki;T. Hamana;N. Yoshida
影响因子：
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作者：
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DOI：
10.1088/0004-637x/748/1/56
发表时间：
2011-08
期刊：
The Astrophysical Journal
影响因子：
--
作者：
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影响因子：
4.8
作者：
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通讯作者：
P. Fosalba;E. Gaztañaga;F. Castander;M. Crocce
DOI：
--
发表时间：
2011-10
期刊：
--
影响因子：
--
作者：
R. Laureijs;J. Amiaux;S. Arduini;J. Auguères;J. Brinchmann;R. Cole;M. Cropper;C. Dabin;L. Du
通讯作者：
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